What kind of algae is this?

[BlakeK.]

Not too worried, but I am curious as to what kind of algae this is? It’s the dark green almost brownish stuff. It seems to grow way more when I cut back on my chaeto. It’s only in the sump. Anybody have this? Good? Bad?

 

[sfin52]

Could be some type of Cyanobacteria

 

[BlakeK.]

Could be some type of Cyanobacteria

That actually makes a lot more sense. I already have some purple cyno that’s been growing in the sump so I just didn’t expect two different types to be growing.

 

[Palyzoa]

Does it blow off easily with a turkey baster? If not it Could be a sponge.